Astigmatic cabinet.



PATENTED Nov, 28, 1905. y

, I v G. E. HOLMES.

ASTIGMATIG CABINET. APPLIGATI ONIILED JAN.19.1905.

UNITED STATES- PA TENT 'oFFiori.

Specification of Letters Patent.

Patented. Nov. 28, 1905.

Application filed January 19, 1905. Serial No. 241.882-

To all whom it may concern:

Be it known that I, GEORGE E. HOLMES, a citizen of the United States, residing at Lockhaven, in the county of Clinton and State of Pennsylvania, have invented certain new and useful Improvements inAstigmatic Cabinets; and I do declare the following to be a full, clear, and exact descri tion of the invention, such as will enable ot ers skilled in the embodying my improvements.

I Fig. 3 is a vertical sectional view of the same,

taken on the of Fig. 2.

My im roved cabinet I may be made of any s'uita le size and shape and is here shown as rectangular in form and provided with a removable back 2. The front 3 of the cabinet is rovided with a circular opening 4 of suitab e size, and around the upper side of the said opening is a scale 4 To the back 2 at the center of the same is secured an inwardly-extending fixed arbor 5, on which is mounted a tubular axle 6. To the said axle near its inner end is secured a pinion 7, and to the front or outer end of the said tubular axle is fixed a face-disk 8, which is provided with radially-alining slots or openings 9, and has an indicating hand or pointer 10 at one side which alines with the center of the said face-disk and the centers of the said slots. Saidface-disk ispreferablyblackened. Revolubly mounted on the tubular axle 6 is a tubular axle 11, which is adapted to turn independently thereof and is rovided with a pinion 12. At the outer 'en of the said tubular axle 11 'is secured an astigmatic disk 13, which may be rotated thereby and which is just within the face-disk. The said astigmatic disk is provided with astigmatic lines 14 15 of difierent dimensions or widths, which may be made to appear at will through the slots 9 of the face-disk by properly turning the said disks. The hand or pointer 10, carried by the face-disk, coacts with the scale 4" on the front of the cabinet toindicate theposition of the face-disk, this being necessary in plane indicated by the line a a determining the asti matic'axis of an eye. On the inner side of t e. removable back 2 of the cabinet is a vertical guide 16, which is provided on its inner side with a pair of vertical guide-grooves 1718. Rack-bars 19 20 are guided and retained in place by the said guide-grooves 17 18, res ectively, and the said rack-bars respectively engage the pinions 7 and 12. The weight of the said rackbars is such that they normally remain at the lower end of the said guide-grooves, and, hence by their coaction with the pinions and tubular axles turn the disks to their initial positions. Operating-cords 21 22 are respectively attached to the said rack-bars 19 20 andextend through openings in the upper side of the cabinet, so that the operator by means of the said cords may raise either or both of the rack-bars to any required extent, and hence independently turn the face-disk to anyre uired angle and the astigmatic, disk to sue an angle as to cause either the astigmatic lines 14 or the lines 15 to register with and become displayed by the slot 9 of the face-disk.

Suitable springs may be employed in lieu of the weighted rack-bars for turning the disks'to their initial positions, and I do not desire to limit myself in this particular. Neither do I desire to limit myself to the precise'construction and arrangement of devices herein shown and described, asit is obvious that modifications maybe made therein without de arting from the spirit of my invention an within the scope of the appended claims. I

In rear of the movable back 2 and between the same and the wall of a room when the box orcabinet is placed against such Wall is an astigmatic dial-card 25, which is supported and may be raised and lowered by the cord 26. Said cord passes over suitable pulleys 27 and extends to the operator, who will be sometwenty feet, or thereabout, away from the said box or cabinet. It is obvious that by means of the said cord 26 the dial-card may be raised or lowered by the operator, as may be desired.

Having thus fully described my invention, what I claim as-new, and desire to secure by Letters Patent, is.-

1. An astigmatic cabinet having an open ing in its front side, a scale on its front side, an arbor in the cabinet, a face-disk havin a tubular axle revoluble on the arbor, an a pinion on said tubular axle, the said facedisk being further provided With radial openings and With a pointer, the latter coacting with the scale on the front side of the cabinet, an astigmatic disk in rear of the face-disk and having a tubular axle revoluble on that of the face-disk and provided with a pinion, vertically-movable racks mounted and guided in the cabinet and engaging the respective pinions and operating-cords for the respective racks to coact With the racks and pinions to independently turn the said disks to any desired angle, substantially as described.

2. An astigmatic cabinet having an opening in its front side, and a scale, and further provided With a removable back, a face-disk, an astigmatic disk, supports therefor, and means to independently turn them to any desired angle, said disks, supports and turning means being mounted 011 and carried by the removable back of the cabinet, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GEORGE E. HOLMES.

Witnesses:

T. M. STEVENSON, GEo. A. BROWN. 

